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002409 ,. Sediment There is only a small amount of historic daily suspended-sediment data available for the Yampa River basin, These data are .as follows: (1) station 09251000 for 1951-58, and (2) station 09259950 for 1960-64. Daily sediment data are available for two stations in Utah on the Green River located above and below the confluence of the Yampa River. Station 09261000, located down- stream. has been active since 1948, and station 09234500, upstream, was active during 1957-59, During the reconnaissance survey (August-September 1975), 15 suspended- sediment samples were collected. Intermittent sediment samples were collected at selected sites during the spring-runoff flow of 197~ as part of the U.S. Geological Survey's basic-data program. Two dai Iy-sediment stations have been initiated recently as part of the U.S. Geological Survey-U.S. Bureau of Land Management cooperative program; these monitor priority. leasing areas. As part of the assessment project, sediment data-collection activities at the two downstream NASQAN sites, stations 09251000 (daily) and 09260000 (week- Iy). will be revised to evaluate current .sediment discharge of these mainstem streams., The sediment data avai lable on. the Green .River above and below the con.fluence of the Yampa River wi 11 be evaluated in Phase I to see what the . basin-wide sediment yield has been during recent years. The data currently being collected on the Yampa River might be used in conjunction with sediment- yield model ing studies (Phase II). . Trace Elements Historic data are available at two NASQAN stations described earlier (Ficke and Hawkinson, 1975). Quarterly analyses for dissolved and total con- centrations of the following trace elements have been collected as part of the NASQAN project: arsenic, cadmium, chr.omium, cobalt, copper, iron, lead, man- ganese, mercury, selenium, and zinc. During the areal reconnaissance survey (August-September 1975), trace-element data were collected as follows: a, Dissolved and total concentration--cadmium, copper, cobalt, iron, lead, manganese, mercury, nickel, selenium, vanadium, and zinc; b. Stream-bottom sediments--antimony, arsenic, chromium, copper, iron, lead, mercury, and nickel. The bottom-sediment samples, however, were collected only where fine materials were present. At 26 of the reconnaissance-site locations described earl ier (designated by code "M" in table 2) sampl ing wi 11 be conducted quarterly for 1 year for the above trace elements. Supplemental trace-element data will be provided at an additional 24 stations funded under separat~ programs. Historic trace-element data and al~o trace-element data collected during the reconnaissance study will be used to assess the ambient water-quality con- ditions in the basin. The continued quarterly sampling will give some indica- tion of the seasonal variations of trace-element concentrations at selected sites. 13 di;